Haven't seen anyone mention bosco from the Sam and Max games, he's great! The paranoid conspiracy theorist who demands increasingly ridiculous amounts of money every episode for his products!
She's been in almost every Fire Emblem game as a merchant, not just in FE:A, and is extremely memorable as the character that has appeared in the most Fire Emblem games.
you can tell in this thread who has never played an animal crossing game, Tom nook is evil incarnate deserved the number 1 slot. The tops 3 though is perfect for once.